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A technology of induction heating and treatment method, applied in the field of roll manufacturing, can solve problems such as difficulty in local tempering treatment, and achieve the effects of reducing heat treatment energy consumption, reducing production costs, and strong operability
Inactive Publication Date: 2021-05-18
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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Abstract
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Problems solved by technology
[0004] The purpose of the present invention is to provide a treatment method for induction heating and tempering, which is used to solve the technical problem that local tempering is difficult when there are differences in the technical indicators of multiple parts of a single roll product
Method used
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Effect test
Embodiment 1
[0023] A treatment method for induction heating and tempering, the requirements for the work roll are as follows:
[0024] Roll specification: ￠520 / 490×1200×2850, unit weight: 3.05 tons;
[0025] Main roll neck￠340×430 Hardness requirement: HSD55-65;
[0026] Roll material: alloy forged steel;
[0027] Using electric furnace smelting + ladle refining + electroslag remelting, the steel ingot is heated and forged according to the process requirements to make a roll forging billet, and then the roll is induction quenched.
[0028] Temper the main roll neck ￠340×430 (hardness in the quenched state HSD80-95) to meet the corresponding hardness requirements. The specific steps are as follows:
[0029] A, the roll after the quenching treatment rotates at a speed of 15 rpm;
[0030] B. Conduct induction heating and tempering: conduct induction heating and tempering on the main roll neck, the final target heating temperature is 580°C, the operating speed of the electromagnetic induct...
Embodiment 2
[0033] The difference between this embodiment and Embodiment 1 is that the induction heating and tempering in step B operates in four stages, and the operating temperatures of the four stages are 150°C, 300°C, 450°C, and 580°C, respectively.
Embodiment 3
[0035] The difference between this example and Example 1 is that the induction heating tempering in Step B is run in ten stages, and the operating temperatures of the ten stages are 150°C, 200°C, 250°C, 300°C, 350°C, 400°C, 450°C, 500°C, 550°C, 580°C.
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Abstract
The invention relates to an induction heating tempering treatment method, and belongs to the technical field of roller manufacturing. A roller to be subjected to tempering treatment is locally heated by an electromagnetic induction coil to be subjected to tempering treatment. The induction heating tempering treatment method comprises the following steps that A, the quenched roller rotates at a certain speed; B, the electromagnetic induction coil is operated to conduct multi-stage induction heating tempering on local parts of the roller, wherein the operation speed of the electromagnetic induction coil is 50-100 mm / min, and the final target heating temperature is 200-600 DEG C; and C, air cooling is conducted, and then the roller subjected to tempering treatment is machined into a finished product. According to the induction heating tempering treatment method, the multiple local parts, having different technical indexes, of the roller are subjected to tempering treatment through the induction heating tempering heat treatment method, the heat treatment state and form and location tolerance of other parts are not affected, and operability is higher. Compared with an overall heating tempering treatment mode, the heat treatment energy consumption is greatly reduced, the heat treatment energy consumption is saved by 50% or above, and the production cost of the roller is remarkably reduced.
Description
technical field [0001] The invention relates to a processing method for induction heating and tempering, and belongs to the technical field of roll manufacturing. Background technique [0002] After the roll is quenched, it is usually put into a resistance furnace for overall heating and tempering. Its advantages are high furnace loading rate and relatively large processing batches. The disadvantage is that the overall heating energy consumption is relatively high, and when the technical indicators of multiple parts are different, heat treatment is difficult. It is relatively large, which limits the production arrangement, especially when it is necessary to ensure that a certain part is not affected, the overall heating treatment is basically impossible to complete. [0003] Induction heating has fast speed and high production efficiency. It is usually used for heating and quenching, and it is often used for tempering, which often causes thermal stress cracking and fatigue. ...
Claims
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Application Information
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